Irq Status Registers (Isr16, Isr) - Renesas H8S/2100 Series Hardware Manual

5.3.6

IRQ Status Registers (ISR16, ISR)

The ISR registers are flag registers that indicate the status of IRQ15 to IRQ0 interrupt requests.
• ISR16
Bit Bit Name
7 IRQ15F
6 IRQ14F
5 IRQ13F
4 IRQ12F
3 IRQ11F
2 IRQ10F
1 IRQ9F
0 IRQ8F
Note: * Only 0 can be written for clearing the flag.
Initial Value R/W
0 R/(W)*
0 R/(W)*
0 R/(W)*
0 R/(W)*
0 R/(W)*
0 R/(W)*
0 R/(W)*
0 R/(W)*
Description
[Setting condition]
When the interrupt source selected by the ISCR16
registers occurs
[Clearing conditions]
•
When writing 0 to IRQnF flag after reading
IRQnF = 1
•
When interrupt exception handling is executed
when low-level detection is set and IRQn or
ExIRQn input is high
•
When IRQn interrupt exception handling is
executed when falling-edge, rising-edge, or
both-edge detection is set
(n = 15 to 8)
Note: The IRQn or ExIRQn pin is selected by the
IRQ sense port select register 16 (ISSR16).
Rev. 1.00 Apr. 28, 2008 Page 97 of 994
Section 5 Interrupt Controller
REJ09B0452-0100